Chalk Holder
thingiverse
Pulling on the plastic slider tightens it, allowing the chalk to write smoothly. Loosen the tension by sliding it back up, and your pencil markings won't be so hard. The device's smooth operation comes courtesy of green H&H 3D Plastics Filament used in its printing process. For more details on how it works, visit this link: http://goo.gl/MhPyri
Download Model from thingiverse
With this file you will be able to print Chalk Holder with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Chalk Holder.